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92 lines
3.3 KiB
C++
92 lines
3.3 KiB
C++
//===--- LLVMSwiftAA.cpp - LLVM Alias Analysis for Swift ------------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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#include "swift/LLVMPasses/Passes.h"
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#include "LLVMARCOpts.h"
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#include "llvm/Analysis/TargetLibraryInfo.h"
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#include "llvm/IR/LegacyPassManager.h"
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#include "llvm/IR/Module.h"
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using namespace llvm;
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using namespace swift;
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//===----------------------------------------------------------------------===//
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// Alias Analysis Result
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//===----------------------------------------------------------------------===//
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static ModRefInfo getConservativeModRefForKind(const llvm::Instruction &I) {
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switch (classifyInstruction(I)) {
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#define KIND(Name, MemBehavior) case RT_ ## Name: return ModRefInfo:: MemBehavior;
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#include "LLVMSwift.def"
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}
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llvm_unreachable("Not a valid Instruction.");
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}
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ModRefInfo SwiftAAResult::getModRefInfo(const llvm::CallBase *Call,
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const llvm::MemoryLocation &Loc,
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llvm::AAQueryInfo &AAQI) {
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// We know at compile time that certain entry points do not modify any
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// compiler-visible state ever. Quickly check if we have one of those
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// instructions and return if so.
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if (ModRefInfo::NoModRef == getConservativeModRefForKind(*Call))
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return ModRefInfo::NoModRef;
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// Otherwise, delegate to the rest of the AA ModRefInfo machinery.
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return AAResultBase::getModRefInfo(Call, Loc, AAQI);
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}
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//===----------------------------------------------------------------------===//
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// Alias Analysis Wrapper Pass
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//===----------------------------------------------------------------------===//
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char SwiftAAWrapperPass::ID = 0;
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INITIALIZE_PASS_BEGIN(SwiftAAWrapperPass, "swift-aa",
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"Swift Alias Analysis", false, true)
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INITIALIZE_PASS_DEPENDENCY(TargetLibraryInfoWrapperPass)
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INITIALIZE_PASS_END(SwiftAAWrapperPass, "swift-aa",
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"Swift Alias Analysis", false, true)
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SwiftAAWrapperPass::SwiftAAWrapperPass() : ImmutablePass(ID) {
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initializeSwiftAAWrapperPassPass(*PassRegistry::getPassRegistry());
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}
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bool SwiftAAWrapperPass::doInitialization(Module &M) {
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Result.reset(new SwiftAAResult());
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return false;
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}
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bool SwiftAAWrapperPass::doFinalization(Module &M) {
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Result.reset();
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return false;
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}
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void SwiftAAWrapperPass::getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesAll();
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AU.addRequired<TargetLibraryInfoWrapperPass>();
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}
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AnalysisKey SwiftAA::Key;
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SwiftAAResult SwiftAA::run(llvm::Function &F,
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llvm::FunctionAnalysisManager &AM) {
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return SwiftAAResult();
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}
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//===----------------------------------------------------------------------===//
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// Top Level Entry Point
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//===----------------------------------------------------------------------===//
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llvm::ImmutablePass *swift::createSwiftAAWrapperPass() {
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return new SwiftAAWrapperPass();
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}
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